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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdefd9fdc29602fdd9dc19ba23478264b6686a04e0df1055a64fc4adf64141f7' 
  AND token = 'u8BFbayq4ZX1w9zuI41/FxafjYYhho1NtcBJhEsdf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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