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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a2e8c57ec3bae10a01ec5f0d5d2918f5a3cd1ec4e35fdcfc3003987c4c39cb4' 
  AND token = 'EVtJ1gZw6kPSdYcCvu8KrJ13JjieWYqJF5vyap2K5A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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