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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea13c3669db4dc4e16cba44fa6520eaab295cc63111abe0d9776977f8f81ddc1' 
  AND token = 'Ao5u6/inW3LQ7b4qcAlUfVnMr1zF6NJnwNMD7Ct1UV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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