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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3fa4b5feac4f1c9b20e4de41c377b71e995e259398fb33274800a42133727a' 
  AND token = '2Q1KRf5SnW+x8Tgl+s4BVje50DBSe7E6c6yBTljw6Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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