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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ab6b724a9a18182fc824f8d3077eb8282ded250820c7d1f5eba4a529291acb' 
  AND token = 'Ih7zV6tlsQXiDoHCdzWRvtRB5beAr8gtbZvKTI1c0yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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