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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b852041efd56e4492f0aaea15038bd63ea9904ff1c78542c6fdbf75f00d02808' 
  AND token = 'f4rOChD4QILiR71G1YCgTFKWtUCD1v4liV57NAqRfbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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