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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac702d1e3ebe398a29cab673150fe203dfa49bf71ed9fed25e0036c0b79cffca' 
  AND token = '7EkmYpBKfv6LqFNyTFn41O6gfpyS0LTCARsf8CyvPTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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