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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75c5ba2fb07e39cfaa91249cde4c3f0c378f5a2719a4bcde7c446a93353d310c' 
  AND token = 'LwRMZkIDF2Mu8mj/RmIbR1id2C4uheRGXoZZjykz/oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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