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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cf8514e9dd3e44c5808b2dc02b5f5326f461bcf3eb91bd4aed0986a576891a8' 
  AND token = '/1fLBVt1rsRzv2z1r3GFp3M+1cWOzsgqdCvSTONEOfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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