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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7bee9a9d0607b1c7f16db29546a6a2b9a88319efa2ac5d50aa24212f223adcf' 
  AND token = 'Guy7n/SkxTvJD9EPZ0vYYfzIwXFA/Y2RRa0kZuFnbPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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