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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f32d691880df2a30529f197c007b4115673128d42901a71ee868d70fc3f4b18f' 
  AND token = 'arhQ/T5rcg3L2r7EAVItYGtSmQ1eNSrt8UXCeuoJjcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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