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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b8175e3f5321c0f21728b31c9d32db3b0ce522ab617bee155f07d4def44a6ae' 
  AND token = '/LT5nqxYRfl6DAH2m7bvfSwJZp3r9ZRkwW0CYwsnQC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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