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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e31d8d3e3be8c32541aa4b62618f6ac2a268d9a763795db45a95cabe63771634' 
  AND token = 'pgviE/WiwNBbUleHbsDEn+fWqXfDyVeSjOjr36b0SgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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