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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64df693112d556a2ab124565f19db486cef728e25711ba25633c6497f70dc9e5' 
  AND token = 'Mvq4nXC4CFycLPl8qzAgRODFUYa1EgacQa0XJIcQii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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