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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e216ea49ab3807f66fb8552d147b7e3c78edf4f615a5c5098560e0b897180b4c' 
  AND token = '9zZFPeauYTI8AZ344tcluTuM0HDdFy8rwJrVQLbe0Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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