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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '868696f1dafb771d05a2ebf7caaef26e0e2e03e76a28de8bc2a27e048bec0939' 
  AND token = 'q7JwYIq/Au9puE22KJx47UqS0ej0wfg1ol/FXlUgtvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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