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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '894c485f2c06951a7c6e6dc225c561adb8026e4409d539a1e40615263deb816a' 
  AND token = 'yY2Aslj2pydcDX3J467gtDB/ETLNngzRwee008Nju6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}