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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6c75eb95501756b985dc0d6e1ba107c69906e105cf4c0dd5d3c30df9aaacbd8' 
  AND token = '1BaVvziTESbXsXXXG5FVIfau3wQ0yBrt+19FYM9AygQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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