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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0165175eed9d1549ae6fd019b3ce2773cbfc862712f5436078d9b30257902fcf' 
  AND token = 'ESK/fbopjt6WvcykY8zkhkYWL+d8qfykDLbFiYe76pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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