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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7722ea6c7d3a7aa59ed0f34629cd7c657d555c2ca9250bb1d60a7a739b2ca1ae' 
  AND token = '9e+dgekX3Jnw89la90+uZZXh2F9wrBaqXwD10IQuCz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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