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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c1f32bea7bec610bdc533d8e01812111ec5a48b8383e138620e0b5111e170d5' 
  AND token = 'Uz1TAP6c6HP4MaShJFnj6oyfHeDq1xbCXG+zw3TFLtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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