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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823bf54dc06059b51fe0e17904e40c2a5801d213551aec7c34993c2e4de5ad4d' 
  AND token = 'GsBo07blhNofE3u4ORSFAn9XWhCmUTofV4rRQVn3QrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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