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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55719f8cfe01d37246bb3aa57bb216408098e7a6fcbf4d596d066a4267b110aa' 
  AND token = 'bN/E1UTfguI7q/pxhVsRvVA6izHNvQE3x20QVvHxs84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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