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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7258558327dc0aae5f5bd3997d83959bba9df090d1f2750c2ccc184dc0cb01d9' 
  AND token = '3bYv4xtmW9ZIzF6D3evOTPQi7IbY8KPmlK4AIwJ+DfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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