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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd10ace80c5e2c9a626498db250c7609a9f2f75abb5b8c5f7dfad91cb41cdba8' 
  AND token = 'pgW9XSACZmaiEnixegxEfsVWS7m5BmP1bEmYwKE5xOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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