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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ce5a12fa2338f14142cecb31888474971609a78336f57e92a28964b830c51a' 
  AND token = 'hyufMFHsHDSw/FsnQ8qvzV2F1B185SnNblyHosXWttE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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