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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1a95f7b546a44f995f7e295d5c2d60dbd0227f17771f8a45adec1f7fbee82e5' 
  AND token = 'sJxAIh6x0nUUE5dNn1Nvwf+tIYujgaciGuF/+5tMx+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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