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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0cf347030665f832ad29e0c4483f478abd1647ad5c625a8b85d853ca56d0e5b' 
  AND token = 'kmyaLQkZvT57tQIbhwLTuVlJbl6TQkSipvoG2mxpq1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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