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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69dda2815132ceca96ed76481c3b184c9b1bab5ab377a2a1a2e6c042419e446b' 
  AND token = 'g7LzbaBXn3ENYCa976vkMcViv2e/hUgHTmJLC15tdaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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