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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db7a2666e426d2edb5e759bd535040137d7ff640348f759ef2e32f9885db52ab' 
  AND token = 'Jjner1vQRl1tVQdKDGR70X++ex843FBlBFerc5mZvrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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