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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edccf879b6162f9de2f47b7a03e6adf9c8d62ba95662c88fc6a44eb72d7e6cc9' 
  AND token = 'hKC6Jq1+/afcWI5Gz1vaxMdPf47AJW9ukPmAbfGiZuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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