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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13354002ce8c587af063596be8962fc90a14ed2edbdc674d8067e7107789e68b' 
  AND token = 'o1PUgSTtdrRqeJNo0CXZk+TcRpxCfPtgQYP3eCkpN6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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