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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5947b7a0c20d2c094c6e5ac98518bcfdfd14a286039f05303c2b90d1ced07c4' 
  AND token = 'j0po1zv/NFkPIxc1lbSZa4itSXPJtxd+EYoZT3HWI7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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