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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa7d71fa1bfdd725f340625c09a65f6a44364b53d495245ef0c1a42610c02bc9' 
  AND token = '8J0JTfHtUGSJDyYlAQ0Pr4r7HG7PyPAZVWW3z2i7hq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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