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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69d6e574a4f8637321e5cf08bbeb2c7120dbfa123f41304d62f2c78d44113fdf' 
  AND token = 'a/IZBERf25hJJ8d61OU/pMhioL7tj6QLkJJqjejXuho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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