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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fdae6b22ebebcc9bc81740e07dec7c8ace19f5abc7d9657a895803d3ca342a5' 
  AND token = '9zUrIVpKtNEYvLWooEbCoZvttXg/eC2INM81d7w5EjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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