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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3987691e4ea157e659ca8044ec7ab589198d24af48aee4a1f5f55532ea6d4087' 
  AND token = 'e1lAchg/4oMVakgVwsiU+Nr3FRFmEgztx3Sso6jNRb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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