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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f8a71248b22f18866ae82d7736f08959361f2133a7e7187ed0c50bb530737bd' 
  AND token = 'VlYwrfOQvyMaMdizXVBlPk3KKkQ0iyjAK0BWdpf3IT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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