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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8d87af4b3b219b514941d95ae783dd1a4e9bfaa5ab4f847060180709782eba3' 
  AND token = 'QqSw14ReWFH4YrDEsFqvfRXMed3xDt48Qx8RV2nRz1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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