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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '509e8b689f43ef8c9d653921a1c3e3432703fb05707e7189386235c5b69229d1' 
  AND token = 'Ereq8GYL6AH6JObuaKLEi1xayoEVVlF535T41+hGtE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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