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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ccc81ecc9b21b028d3076c68582a90ba05246c627e57bd656b6e5f1b5cc9921' 
  AND token = 'm0Ak0ggVDGDw1vlw17hq8idvx+egvC1S+fW8iVD8Grc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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