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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4ab65d618eefafbeadc564d8e6433af489098943bef8c63a54ef5c19a5398e' 
  AND token = 'wmz4Ua6LSsNfpF/sklUn54SDw+Rw6zsw0AE8yUjAPz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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